Micro parts molder Medical Murray Inc. will extend the range of its machines with the installation of a new Sumitomo injection press, the North Barrington, Ill., firm's fifth press.
Medical Murray will be able to mold parts up to 0.34 cubic inch, using shot sizes up to about 0.2 ounce with the new press, President Phil Leopold said in a telephone interview. Its largest parts on existing equipment entail volumes up to 0.018 inch and shot sizes up to about 0.01 ounce.
Leopold said the new press should deliver the precision his firm's medical-device customers demand. The new press can shoot resin in quantities as small as 0.00035 ounce. Leopold expects the press to be operational by mid-April.
The all-electric machine has 7 tons of clamping force. It has a 14-millimeter screw specially designed for tiny shot sizes. Unlike some small presses, where a 14mm screw is an option, in the Sumitomo SE7M's press it is standard and the press is designed around it. A special check valve is among other engineering features aimed at micromolding.
Leopold said his firm specializes in insert molding of tiny parts, often using multiple polymers and metal inserts. Radiographic markers are an example of the specialized work the company does.
Medical Murray has an injection press for liquid silicone rubber, a screw-driven vertical press and two Sesame-brand presses that the firm developed itself and that are sold by C.A. Lawton Co.'s plastics division in De Pere, Wis.
Medical Murray moved to its current facility from a smaller head office in Buffalo Grove, Ill., in January 2006.